Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2007-03-07
2008-12-02
Vu, David Hung (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S307000, C315SDIG002
Reexamination Certificate
active
07459862
ABSTRACT:
A high efficiency electronic ballast for large power metal halide lamp includes a power input circuit, a power factor correction circuit, a secondary power supply, a control circuit, a half bridge power converter, a resonant starting circuit, and lamp current on/off detector. The half bridge power converter has two DC block output capacitor to protect the converter when the output is shorted to ground. The operation frequency of the converter is chosen in the weak area of the acoustic resonant to avoid the acoustic resonant in the lamp. The control circuit adds a method for deep frequency and amplitude modulation and delay control function to the converter. For fine sweep pass through the output resonance point for igniting high voltage, two sweep rate control circuits are added. The metal halide lamp can be operated with very stable from starting to normal operation with high electronic ballast system efficiency.
REFERENCES:
patent: 6426597 (2002-07-01), Rast et al.
patent: 2004/0095076 (2004-05-01), Kastle et al.
Chen Heping
Chen Min
Kong Qin
Zhang Wenxiong
Chan Raymond Y.
David and Raymond Patent Firm
Fujian Juan Kuang Yaming Electric Limited
Vu David Hung
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